Tcl

Verify Connectivity to the SMTP Server

Demonstrates the Chilkat MailMan.VerifySmtpConnection method, which tests whether a TCP/IP connection can be established with the configured SMTP server. It verifies connectivity only — it does not authenticate. This example configures the SMTP host and checks whether it can be reached.

Background: When a send fails, it helps to know where it broke. VerifySmtpConnection isolates the first hop — can the client even reach the server on the configured host and port, and complete the TLS handshake? A failure here points at networking, firewall, DNS, port, or certificate issues rather than credentials. Once connectivity is confirmed, VerifySmtpLogin tests the authentication step.

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Tcl


load ./chilkat.dll

#  Demonstrates the MailMan.VerifySmtpConnection method, which tests whether a TCP/IP
#  connection can be established with the configured SMTP server.  It verifies connectivity
#  only (it does not authenticate).

set mailman [new_CkMailMan]

#  Configure the SMTP server connection.
CkMailMan_put_SmtpHost $mailman "smtp.example.com"
CkMailMan_put_SmtpPort $mailman 465
CkMailMan_put_SmtpSsl $mailman 1

#  Test connectivity to the SMTP server.
set connected [CkMailMan_VerifySmtpConnection $mailman]

if {$connected == 1} then {
    puts "Successfully connected to the SMTP server."
} else {
    puts "Could not connect to the SMTP server."
}


delete_CkMailMan $mailman